IS 3513-1: Resin treated compressed wood laminates (compregs) - Specification, Part 1: For electrical purposes

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IS 3513-1 (1989) : Resin treated compressed wood laminates
(compregs) - Specif ication, Part 1: For electrical purposes
[CED 20: Wood and other Lignocellulosic products]

Jawaharlal Nehru
'Step Out From the Old to the New'

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2*S< W I *>S*V2^NK^

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Satyanarayan Gangaram Pitroda
Invent a New India Using Knowledge

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BLANK PAGE

*rt*2V^

PROTECTED BY COPYRIGHT

IS: 3513 ( Parti)- 1989

REAFFIRMED

Indian Standard ^

SPECIFICATION FOR
RESIN TREATED COMPRESSED WOOD

LAMINATES (COMPREGS)

,PART 1 FOR ELECTRICAL PURPOSES

( First Revision)

FirstReprint AUGUST 2001

UDC 674.812.2 : 678.632 : 621.315.619

© BIS 1989

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 1 1 0002

October 1989 Price Group 4

AMENDMENT NO. 1 NOVEMBER 1998

TO

IS 3513 ( PART 1 ): 1989 SPECIFICATION FOR RESIN

TREATED COMPRESSED WOOD LAMINATES

(COMPREGS)

PART 1 FOR ELECTRICAL PURPOSES

(First Revision)

igeS, Table 3, SI No. 1
the end.

(CED20)

( r irst Revision j

( Page 5, Table 3, SI No. 1 and 2, col 2 ) — Insert 'along the grain direction' at
end.

Reprography Unit, BIS, New Delhi, India

AMENDMENT NO. 2 JULY 2005

TO

IS 3513 (PART 1) : 1989 SPECIFICATION FOR

RESIN TREATED COMPRESSED WOOD LAMINATES

(COMPREGS)

PART 1 FOR ELECTRICAL PURPOSES

( First Revision )

( Page 3, clauses 7,1 and 7.1.1 ) — Substitute the following for the
existing:

'7.1 Boards

The dimensions of resin treated compressed wood laminate boards shall be as
follows:

Length in mm 2 400, 2 100, 1 800, 1 500, 1 200, 900 and 600

Width in mm : 1 200, 900, 600, 300 and 150

NOTE — Any other dimension as agreed to between the manufacturer and the purchaser may
also be used. '

( Page 4, clause 7.1.2 ) — Renumber the clause and substitute the
following for the existing:'

'7.1.1 Thickness

Unless otherwise specified the thickness of resin treated compressed wood
laminate boards shall be 3 mm, 4 nun, 5 mm, 6 mm, 8 mm, 12 mm, 16 nun,
20 mm, 25 mm, 32 mm, 40 mm, 50 mm, 60 mm and 70 mm/

( Page 4, clause 7.1.3 ) — Renumber the clause and substitute the
following for the existing:

Amend No. 2 to IS 3513 ( Part 1 ) : 1989

*7.L2 Tolerances

The tolerance on the nominal sizes of finished boards shall be as follows:

Dimensions

Tolarance

Length

+6 mm

-Omm

Width

+3 nun

-Omm

Thickness:

i) Less than 6 mm

10 percent

ii) 6 mm and above

5 percent

Edge straightness

2 mm per 1

Squareness

2 mm per 1

(CED 20)

Reprography Unit, BIS, New Delhi, India

AMENDMENT NO. 3 FEBRUARY 2009

TO

IS 3513 (PART 1) : 1989 SPECIFICATION FOR RESIN

TREATED COMPRESSED WOOD LAMINATES

(COMPREGS)

PART 1 FOR ELECTRICAL PURPOSES
( First Revision )

(Page 2, clause 5.2) — Substitute the following for the existing:

'The synthetic resins used for impregnation and bonding of veneers shall be of
phenol or cresol formaldehyde type and the resultant resin adhesive shall
conform to the requirements specified in IS 848 : 2006.'

(Page 4, Table 1) — Substitute the following for the existing table:

Table 1 Physical Properties of Compregs (All Types)
(Clause 8.1)

SI

No.

Property

r~

Requirement

Method of Test

^

Types I, II,

and IV

III

Types V
and VI

i)

Specific gravity, Min

1.25

1.25

IS 1708 (Part 2): 1986

ii)

Moisture content and volatile
matter, percent, Max

4

4

IS 1708 (Parti): 1986

Jii)

Water absorption at 27 ± 2°C,
percent, Max

1.2

1.5

IS 3513 (Part 4): 1966

iv)

Sporadic working temperature,
Max

90°C

90°C

IS 3513 (Part 4): 1966

[Page 5, Table 3, (see also Amendment No. 1)] — Substitute the following
for the existing table:

Amend No. 3513 (Part 1) : 1989

Table 3 Mechanical Properties
(Clause 8.3)

St

No.

Teat

Unit

Requirement
A

Method of Test

f
TypeV

Type VI

0)

(2)

(3)

(4)

(5)

(6)

Tensile strength, Min\

a) Along the grains

b) Across the grains

MPa
MPa

140

70
50

IS 1734 (Part 9): 1983

ii)

Static bending strength, Mln:
a) Along the grains

MPa

185

90

IS 1998: 1962

b) Across the grains

MPa

-

65

iii)

Compressive strength, Min\

a) Parallel to laminae

b) Perpendicular to laminae

MPa
MPa

160

110
170

IS 1708 (Parts 8 & 9):
1986

iv)

Shear strength, Min:

a) Parallel to grains &
laminae

b) Perpendicular to grains &

laminae

MPa

MPa

12
50

15
40

IS 1708 (Part 11):
1986

v)

Hardness, Rockwell, Mtn,
M scale

70

70

IS 1586: 2000 '>

V!)

Impact/strength, Izod,
Un-notched, Mm:
a) Perpendicular to laminae

kg/m 2

0.45

0.30

IS 1998 : 1962

b) Parallel to laminae

kg/m 2

0.25

0.20

Rockwell hardness in M scale shall be determined using an indenter of diameter of 6.350 ± 0.002 !
mm and with Minor load of 10 kg and Major load of 100 kg.

(Page 6, Annex A) — Substitute the following for the existing entries:

'IS 848 : 2006 Synthetic resin adhesives for plywood (phenolic and
aminoplastic) — Specification (second revision)

IS 1586 : 2000 Method for Rockwell hardness test for metallic material
(scales A-B-C-D-E-F-G-H-K 15N, 30N, 45N, 1ST, 30T
and 45T) (third revision)*
(CED20)

Reprography Unit, BIS, New Delhi, India

Wood Products Sectional Committee, BDC 20

FOREWORD

This Indian Standard ( Part 1 ) ( First Revision ) was adopted by the Bureau of Indian Standards on
22 April 1989, after the draft finalized by the Wood Products Sectional Committee had been
approved by the Civil Engineering Division Council.

Resin treated compressed wood laminates, also known as compregs, are laminates made from thin
wood veneers and thermosetting phenol or cresol formaldehyde resins. They combine within them-
selves enhanced mechanical properties with the stabilizing and moisture-proof qualities of thermosetting
resins; besides, they have good machining properties, electrical insulation, and resistance to corrosive
agents and termite attack. Compregs are manufactured in different shapes, such as, sheets, rods and
moulded shapes.

In the electrical industry, compregs are extensively used for lifting rods and guide plates in HV circuit-
breakers; cleats and supports for HV tappings in transformers; insulating stator brackets in turbo-
generators; drums and finger boards for traction control gear; stay wire insulators, insulating studs,
nuts, bolts, etc.

The grading of compregs is based upon the extent and nature of impregnation of the resin-forming
chemicals, and also upon the compression and density as a result of pressure applied for curing and
bending whereas the different types in each of the grades indicate the arrangement of the veneer, and
therefore the relative orientation of wood fibre in various directions.

The dimensions of compreg boards and rounds have not been covered exhaustively as these vary widely
depending upon end use. However, for general guidance, certain stock dimensions have been
indicated.

This standard was first published in 1966. In the present revision, the requirements of various
properties of compregs have been revised keeping in view the latest developments in the industry and
the feedback from the users.

This standard is now published in four parts, namely.

Part 1 For electrical purposes

Part 2 For chemical purposes

Part 3 For general purposes

Part 4 Sampling and tests

For the purpose of deciding whether a particular requirement of this standard is complied with, the
final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in
accordance with IS 2 : I960 'Rules for rounding off numerical values ( revised )\ The number of signi-
ficant places retained in the rounded off value shouio be the same as that of the specified value in this
standard

IS 3513 ( Part 1 ) : 1989

Indian Standard

SPECIFICATION FOR

RESIN TREATED COMPRESSED WOOD

LAMINATES ( COMPREGS )

PART 1 FOR ELECTRICAL PURPOSES

( First Revision )

4.2 Types

1 SCOPE

1.1 This standard ( Part I ) covers the _ -.
requirements of resin treated compressed wood Jr£2S S fa board-
laminates ( compregs ) for electrical purposes. vc " ecrs in a r>oara *

4.2.1 The types of compreg shall be as follows,
depending on grain orientation of individual

1.2 This standard does not cover the require-
ments for solid compressed wood.

2 REFERENCES

2.1 The Indian Standards listed in Annex A are
necessary adjuncts to this standard.

3 TERMINOLOGY

3.1 For the purpose of this standard, definitions
given in IS 707: 1976 and the following shall
apply.

3.2 Compreg

A wood-based laminated material made from
thin wood veneers either impregnated under
vacuum and/or pressure with synthetic resins or
coated with synthetic resin or interlaid with
synthetic impregnated paper and further bonded
and densified under heat and pressure. The synthe-
tic resins are usually of phenol or cresol/formal-
dehyde type.

3.3 High Density Compreg

Compreg with specific gravity between 1*25 and
1'35.

4 TYPES

4.1 Compreg for electrical purposes shall be a
fully impregnated, high density material suitable
for HV and LV electrical insulation requirements
and for certain general mechanical purposes. This
grade shail have six types, that is Type I to VI.

a) Type I — In this type, the grain orientation
of the constituent veneers shall be substan-
tially tangential to the periphery of the
board or the round. The joints in the
adjacent layers of laminae shall be stag-
gered. This type is suited for fabrication
of large circular rings.

b) Type II — In this type, the grain orienta-
tion of the constituent veneers shall be
more than 75 percent in the direction of
the major mechanical stress. Every fourth
veneer comprising this type shall have its
grain direction at right angle to the grain
direction of adjacent three veneers which
will have their grains in the same direction.

The mechanical properties achieved in this
type are generally comparable to Type V
but the cross lamination gives improved
resistance to splitting. This arrangement
is specially suitable for tensile links where
the end fixings are in the form of bolts or
rivets located close to the end of the com-
ponents.

c) Type III — In this type, the grain orienta-
tion of the constituent veneers shall be
approximately equal in all radial directions.
This type shall have each successive lamina-
tion angularly disposed in relation to the
adjacent one.

This type is suited for fabrication of gears,
chucks and wheels.

d) Type IV -- In this type, the grain orienta-
tion of constituent veneers shall be oriented
mainly at 45° to the load axis.

This arrangement is suitable for parts under
high voltage stress with limited clearances.

1

IS 3513 ( Part 1 ) : 1989

c) Type V — In this type, the grain orientation
of the constituent veneers shall be in the
direction of axis of load.

This type is suitable for parts subject to
tensile stress and is thus suited for fabrica-
tion of sticks, flats, rods, turned parts and
threading.

f ) Type VI — In this type, the grain orienta-
tion of the constituent veneers shall be
more or less equal in each axis, at right
angles to each other.

This type is of high compressive strength
in the direction of its thickness and is also
rigid. It is suited for sheet and block
forms.

4.2.2 Typical sketches illustrating the directions
of grains of the veneers in the assembly for
various types are indicated in Fig 1.

5 MATERIALS

5.1 Timber

Any non-resinous species of timber be can be used
for the manufacture of veneers required for
making compreg.

5.1.1 The veneers shall be either rotary cut or
sliced and maximum variation in grains shall not
exceed 1 in 10. They shall be smooth, free from
knots, splits, dry rot or any other type or rot,
and resin pockets. The veneers shall be of uniform
thickness with tolerance of ± 5 percent, and
dried to a suitable moisture content not exceeding
8 percent.

5.1.2 In selecting the species for the manufacture
ofcompregs, it is recommended that, as far as
possible, a single species of timber be used in a
pack and where combination of different species
is unavoidable, care shall be taken to prevent
incompatibility of various species in the physical
and mechanical properties.

5.2 Synthetic Resins

The synthetic resins used for impregnation and
bonding of veneers shall be of thermosetting
phenol or cresol formaldehyde type and shall
generally conform to IS 848 : 1974.

5.3 Solvents

Denatured spirit conforming to IS 324 : 1 59 or
any suitable solvent conforming to its Indian
Standard Specifications, shall be used for compreg
of electrical grade.

5.4 Varnishes

Insulating oils and varnishes used for treating
compreg boards and the machined components of
compreg shall conform to IS 10026 ( Part 3/ Sec
I to 7 ) : 1983. Special high-viscosity insulating
varnishes may also be used for electrical compo-
nents if so required by the purchaser.

6 MANUFACTURE

6.1 Compreg of electrical grade shall be manu-
factured from suitable veneers by impregnating
them with a thermosetting phenol or cresol
formaldehyde resin dissolved in a suitable solvent
like denatured spirit. Vacuum, with or without
subsequent pressure, using a suitable impregnation

TYPE I

TYPE II

TYPE III
SHOWN IN PLAN

TYPE V

TYPE IV

NoTt — Arrows show direction of grains in the laminae.

Fig. 1 Tvphs of Comprfg Showing Arrangfmfnt of Laminai

TYPE VI

IS 3513 ( Part 1 ) : 1989

schedule, shall be applied to ensure that the
veneers are uniformly impregnated to such an
extent that the resin content of the veneers is not
less than 45 percent on an oven-dry basis.

6.1,1 The impregnated veneers shall be dried in a
suitable drier or evaporating chamber at a suitable
temperature to drive off the solvent and moisture,
care being taken that the resin does not polymerize
beyond the desired extent. The impregnated
veneers shall then be inspected, and assembled
into the required grain configuration and pressed
in a hydraulic press at a suitable temperature and
pressure. The press charge shall usually be
cooled by cutting off steam and introducing a
cooling medium.

6.2 Compreg for electrical purposes shall be
manufactured in such a way that the following
conditions are satisfied:

Synthetic Impregnation Percent Curing Curing
Resin Method Resin Tempe- and

Pickup rature Bonding
on Oven Pressure

Dry (Range)

Basis (MPa)

Natural
phenol
formalde-
hyde in
alcohol
solution

Vacuum 45, Min
impregna-
tion with
or without
subsequent
pressure

135
to

150°C

7

to
155

6.3 The thickness of veneers for the manufacture
of compregs shall be between 0*7 and 2 mm.
The thickness of individual veneers shall not vary
beyond ± 5 percent of the average thickness.

6.3.1 The veneers required to be edge jointed
shall be so done on a tapeless splicer and no
staples or tapes shall be used. The adhesive
used for splicing should be compatible with
phenol or cresol formaldehyde resins to be used
later for impregnation and bonding.

6.3.2 Wherein an assembly different species are
used, care shy 11 be taken to see that they are not
incompatible and that they are balanced around
the central axis ( see also 5.1.2 ).

6.3.3 In one pack, usually veneers of the same
thickness shall be used except where adjustment
is to be made for density but in case different
thicknesses are used* these shall be balanced
around the central axis.

6.3.4 The veneers of one pack shall be cut by the
same method, that is, either rotary cut or sliced.
If cut by different methods, these should be so
assembled that these balance around the central
axis.

6.4 The compreg boards after discharge from the
press, shall be kept for a minimum period of one
week to normalize internal stresses and then they
shall be cut to the required sizes and finished.

6.5 The resins used shall have no fillers or
extenders. A suitable modifying agent may be
used to impart the required special properties to
the board.

6.5.1 When the thickness of the board required
exceeds the thickness the press can accommodate,
it may be obtained by glueing two or more boards
using similar and compatible resin used for
impregnation and bonding with the prior approval
of the purchaser.

6.6 A purchaser ordering for machined compo-
nents shall provide the necessary drawings
giving details as to the dimensions of the compo-
nents and tolerances, and the components shall be
supplied in accordance with the drawings.

6.7 The edges of all the boards and the surfaces
of all the components shall be given a protective
coat with suitable insulating varnish conforming
to relevant Indian Standards [ IS 10026 ( Part 3/
Sec 1 to 7): 1983].

7 DIMENSIONS AND TOLERANCES

7.1 Boards

The dimensions of platten finished compreg boards
shall be quoted in the following order:

The first dimension, shall represent the length,
that is, the dimension parallel to the grain of
faces, the second, the width, that is the
dimensions at right angle to the grains of
faces and the third, the thickness.

7.1.1 Size

The stock sizes for compreg boards shall generally
be the following:

mm

mm

2 100

X

1200

2 100

X

900

1 800

X

1200

1 800

X

900

1 500

X

1 200

1 500

X

900

1 500

X

600

1 500

X

300

1 500

X

150

1 200

X

1 200

1 200

X

600

1 200

X

300

IS 3513 ( Part 1 ): 1989

mm

mm

1 200

X

150

900

X

900

900

X

600

900

X

300

900

X

150

600

X

600

600

X

300

600

X

150

7.1.2 Thickness

7.2.2 The tolerance on
rods shall be as follows:

diameters of compreg

The preferred thickness of compreg boards shall
be 3 t 45, 6, 8, 12, 16, 20, 25, 32, 40, 50, 60 and
70 mm.

7.1.3 Tolerances

The following tolerances on the nominal size of
the finished compreg boards shall be permissible:

Dimension

Tolerance

a) Length

: + 6 mm
— mm

b) Width

: + 3 mm
— mm

c) Thickness less than

6 mm

: ±10 percent

6 mm and above

: ± 5 percent

7 J Rods

The sizes for round rods of compreg shall
rally be the following:

Length

Diameter

mm

1 500

1 200

900

600

mm

8 to 50

3 to 50

50 to 80

6 to 40

7.2.1 Compreg rods of longer lengths and inter-
mediate or greater diameters may be manufactured
according to the requirements of the purchaser.

Rods up to and including
40 mm dia

Rods 50 mm dia and above

+ 0mm

— 0'20 mm

+ mm

— 025 mm

73 The purchaser ordering compreg cut to special
size and shapes, such as, round discs, rings and
gear blanks to any required taper or finished
parts, shall provide the necessary drawings speci-
fying material, dimensions and tolerances, and
the supplies shall be in accordance with the
drawing of the purchaser.

7.3.1 Tolerances in finished components or blanks
shall be according to the drawings of the
purchaser.

8 PHYSICAL AND MECHANICAL
PROPERTIES

8.1 The physical properties of compreg for elec-
trical purposes for all types shall conform to
Table 1 when tested by the methods specified
therein,

8.2 Electrical Properties

The electrical properties of the electrical purpose
compreg of all types shall conform to Table 2.

electrical components, the
test requirements shall be

8.2.1 In case of
following further
complied with:

a) All components shall stand a minimum
flashover voltage of 4 kV per cm length
between cylindrical electrodes when tested
according to IS 3513 ( Part 4 ) : 1966.

b) The varnished components for electrical
grades shall have a minimum tracking time
of 20 minutes when tested according to IS
3513(Part4): 1966.

8.3 Mechanical Properties

The mechanical properties of compregs for elec-
trical purposes of Type V and VI shall conform to
Table 3 when tested by the methods specified
therein.

Table 1 Physical Properties of Compregs ( All Types )
( Clause 8.1 )

SI No. Property

i) Specific gravity

ii) Moisture content and volatile matter

Hi) Water absorption at 27 ± 2 C C

iv) Sporadic working temperature

Requirement

1*25, Mln
4 percent, Max
1*2 percent, Max
90°C, Max

Method of Test

IS 1708 (Part 2): 1986
IS 1708 (Parti ) : 1986
IS3513(Part4): 1966
IS 3513 (Part 4): 1966

IS3513(P«rtl):1989

T*bte2 Electrical Properties of Compreg for Electrfeftl Porpoie ( AU Types )

( Clause 8.2 )

SI No. Test

i) Insulation resistance after immersion
in water at 21±2°C

it) Volume and surface resistivity ohm-cm

iii) Flatwise electric strength in oil at 90 ± 2*C

iv) Edgewise electric strength in oil at 90°C

v) Power factor ( tan * )

vi) Comparative tracking index for varnished

components

Reqalreweat

10 Megohms, Mln

2-5x10*

4 JcV/ram for 6 mm thick
specimen

25 kV for 25 mm wide
specimen

0019 at 50 cycles at 20°C
( Typical, not mandatory )

CTI100

Method of Teat

IS 2259 : 1963

IS 3396 : 1979
IS 1998 : 1962

IS 1998 : 1962

IS 1998 : 1962

IS 2824 : 1975

Table 3 Mechanical Properties

(Clauses. 3)

SI No.

Test

Requirement

(1) (2)

1 Minimum tensile strength ( MPa )

2 Minimum static bending strength ( MPa )

3 Minimum compressive strength ( MPa )
(Specimen 20 mm x 20 mm x 20 mm )

a) Parallel to laminae

b) Perpendicular to laminae

4 Minimum shear strength ( MPa )

a) Parallel to grain and laminae

b) Perpendicular to grain and perpendicular
to laminae ( flatwise )

5 Minimum hardness Rockwell M Scale

6 Minimum Impact strength ( Izod ) Un notched
sample ( kg.m/m* )

a) Perpendicular to laminae

b) Parallel to laminae

TypeV

Type VI

(3)

(4)

175

90

195

95

170

120

95

185

14

20

60

45

70

0'50
0'30

70

035
025

Method of Teat

(5)

IS 1734 (Part 9): 1983

IS 1998: 1962

IS 1708 (Parts 8 and 9):
1986

IS 1708 (Part II ): 1986

IS 15$6 : 1988
IS 1998 : 1962

9 WORMANSHIP AND FINISH

9.1 When supplied in board form, the face and
the back of a board shall be free from checks,
splits, blisters, discoloration, overlaps, gaps and
open joints and the boards shall be free from
warp.

9.2 Compreg boards may be
finished, or machine finished.

cither platten

9.2.1 The machine finished boards shall be given
a protective coat of varnish as required by the
purchaser. Usually the edges of the boards shall
be given a coat of protective varnish.

9.2.2 The machined components in case of electri-
cal purpose compreg shall be given a coat of
high viscosity varnish.

IS 3513 ( Part 1 ): 1989

10 SAMPLING

10.1 Sampling shall be as specified in IS 3513
(Part4): 1966.

11 TESTING

11.1 Test pieces cut from each of the boards
selected shall be tested by the appropriate methods
specified in appropriate tables and in IS 3513
(Part4): 1966.

11.2 Tests oo Finished Machined Components

The manufacturer shall furnish a certificate to
the purchaser that the finished component or
part is made from compreg conforming to the
requirements for the particular type as specified
in this standard. If required by the purchaser,
sample test pieces shall be tested from the same
board, and test results thereon should be supplied.

1L3 Re-rests

If any piece fails to fulfil the test requirements
specified under 11.1, a further set of duplicate
samples on the basis prescribed under 11.1 shall
be selected by the purchaser from the same batch
for testing in the same manner. Test pieces
prepared from these two further samples shall
comply with the requirements, otherwise the
batch shall be rejected.

12 MARKING

12.1 If compreg is supplied inboard from, each
board, and if supplied in component form, each
component, or if components are small, each
package of components, shall be legibly and
indelibly marked or stamped with the following

particulars along with such other marks as the
purchaser may stipulate at the time of placing a
contract:

a) Type and finish:

b) Manufacturer's initials or recognized trade-
mark;

c) Year of manufacture; and

d) Batch number.

13 PACKING AND DELIVERY

13.1 The boards or components shall be delivered
in a clean and dry condition and shall be suitably
packed.

14 INFORMATION TO BE SUPPLIED BY
THE PURCHASER

14.1 The purchaser shall supply the following
information to the supplier with his order:

a) Number of boards or number of compo-
nents;

b) Type of material;

c) Size and thickness;

d) If components are required, full detailed
drawings along with the tolerances and
dimensions;

e) Whether supply is to be platten finished or
machine finished;

f) Whether supply is to be oil finished or
varnish finished; and

g) Any other special requirement.

ANNEX A

( Clause 2.1 )
LIST OF INDIAN STANDARDS REFERRED IN THE STANDARD

IS No.
IS 324: 1959

IS 707 : 1976
IS 848 i 1974

IS 1S86: 1988

Title

Specification for synthetic
resin adhesives for plywood
( phenolic and aminoplaslic )
(first revision )

Method for Rockwell hardness
test for metallic material
( Scales A-B-C-D-E-F-G-H-K)
( second revision )

fS No. Title

Specification for ordinary [s 1708
denatured spirit ( revised)

Glossary of terms applicable
to timber technology and uti-
lization ( second revision )

Methods of testing of small
clear specimens of timber
( second revision )

Part 1 : 1986 Determination of moisture
content

Part 2 : 1986 Determination of specific
gravity

Part 8 : 1986 Determination of compressive
strength parallel to grain

Part 9 : 1986 Determination of compressive
strength perpendicular to grain

IS 3513 ( Pwt 1 ) : 1989

IS No.
Part 11 : 1986

IS 1734

Part 9: 1983

IS 1998 : 1962

IS 2259: 1963

[S2824: 1975

Title

Determination of shear
strength parallel to grain

Methods of test for plywood
( second revision )

Determination of tensile
strength

Methods of test for thermo-
setting synthetic resin bonded
laminated sheets

Methods of test for determi-
nation of insulation resistance
of solid insulating materials

Method for determining com-
parative tracking index of

Title

solid insulating materials
under moist conditions {first
revision )

Methods of test for volume
and surface resistivities of
solid electrical insulating
materials (first revision )

Specification for high and
medium density wood based
laminates ( compreg ) : Part 4
Sampling and tests ( under
revision )

IS 10026 Specification for insulating

( Part 3/Sec 1 to 7 ) varnishes containing solvents :
Part 3 Specification for indivi-
dual materials.

IS No.

IS 3396: 1979

IS 3513

(Part4): 1966

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